60results about How to "Small out of roundness" patented technology

The invention provides a three-frequency-band high-gain omnidirectional dipole antenna comprising a three-frequency oscillator array, balanced feeder lines, a first dielectric plate, a second dielectric plate, and a third dielectric plate. The first dielectric plate, the second dielectric plate, and the third dielectric plate are arranged successively from top to bottom. The balanced feeder lines are arranged at the top surface and the bottom surface of the second dielectric plate and are printed along the axis direction of a three-frequency oscillator unit. The balanced feeder lines are parallel dual-line transmission lines. The three-frequency oscillator units in the three-frequency oscillator array are printed at the first dielectric plate and the third dielectric plate; and feeding points among all three-frequency oscillator units are connected by the balanced feeder lines. The three-frequency oscillator units consist of upper arms and lower arms, wherein the upper arms and the lower arms are arranged in a mirror symmetry mode. The upper arms and the lower arms include first branches, second branches, and third branches, wherein the first, second, and third branches are arranged along parallel axes; the second branches and the third branches are arranged at the two sides of the first branches symmetrically and the bottoms are connected into one by horizontal branches; and balanced feeding points are formed at central protrusions of the upper arm and the lower arm. The three-frequency-band high-gain omnidirectional dipole antenna has advantages of high gain, omnidirectivity, high efficiency, small size, and low cost; and an effective or benefical reference is provided for an optimized design of other multi-frequency or broadband high-gain omnidirectional array antennas.

The invention relates to a component comprising at least one structural element (3), especially a moulded part (4), which consists of a powder or a powder mixture containing metallic and optionally non-metallic components, and is produced by pressing said powder or the powder mixture and then sintering. At least one surface section (12) of the structural element (3), which is used to co-operate with another surface section (13) of another component (14, 22) during the application of a pressurised force acting between the two surface sections (12, 13), is coated with a lubricating lacquer (2). The invention further relates to a method for producing one such structural element (3, 14, 22) coated with the sliding lacquer (2).

The invention discloses an omnidirectional antenna and an omnidirectional antenna array. The omnidirectional antenna comprises a dielectric substrate and a first omnidirectional radiation unit, wherein the first omnidirectional radiation unit comprises a main dipole, a parasitic dipole and a metal bottom plate; the main dipole comprises a first metal sheet printed on one surface of the dielectric substrate and a second metal sheet vertical to the dielectric substrate and inserted in the first metal sheet; the first metal sheet, the parasitic dipole and the metal bottom plate are printed on one surface of the dielectric substrate; the first metal sheet is printed in front of the metal bottom plate; and the parasitic dipole is printed in front of the first metal sheet. According to the omnidirectional antenna of the invention, through arranging the parasitic dipole, the bandwidth of the antenna is expanded, and non-circularity of the antenna is reduced; and in addition, by adopting the main dipole in a three-dimensional structure, a larger bandwidth can be provided.

The invention provides a tri-polarized vehicle-mounted antenna applied to a 5G-V2X Internet of Vehicles communication system. The tri-polarized vehicle-mounted antenna comprises a circular dielectricplate, a square dielectric plate, a feed structure and eight groups of inverted L-shaped units, the circular dielectric plate is arranged below the square dielectric plate, and an omnidirectional radiation unit is arranged in the middle of the circular dielectric plate and is responsible for 5.85-5.925 GHz direct connection communication frequency bands; the square dielectric plate is located above the omnidirectional radiation unit of the circular dielectric plate. The center of the square dielectric plate and the center of the circular dielectric plate are located on the same vertical centerline, the area of the square dielectric plate is smaller than that of the circular dielectric plate, and a directional radiation unit is arranged on the square dielectric plate and is responsible fordirectional radiation of a wide coverage surface in 3.30-3.60 GHz and 4.80-5.00 GHz frequency bands. The antenna has the characteristics of triple polarization, low cross polarization, high port isolation, directional radiation mode wide beam and omnidirectional radiation mode low out-of-roundness, realizes relatively high gain on an azimuth angle plane, and meets 5G-V2X requirements.

The invention discloses a broadband horizontally polarized omnidirectional antenna, which comprises a circular dielectric substrate, a broadband microstrip feed network printed at the upper part of the dielectric substrate and a metal grounding plate printed at the lower part of the dielectric substrate, wherein gaps are etched in the metal grounding plate; an SMA connector is arranged on the metal grounding plate at the lower part of the center of the dielectric substrate; two groups of crossed gaps which are arranged at intervals, are the same in size, are alternately arranged along the circumference and are distributed in a central symmetry manner are etched in the circumference surface of the metal grounding plate; a power divider is arranged at the center of the broadband microstrip feed network; impedance transformers which extend along the center of the power divider are distributed along the circumference surface of the broadband microstrip feed network in a radial manner; andmicrostrip broadband baluns extending at a right angle are arranged at the end parts of the impedance transformers. According to the broadband horizontally polarized omnidirectional antenna, the current path is changed, the volume of the antenna is reduced, the impedance bandwidth of the antenna is expanded, the out-of-roundness of a horizontal diagram is reduced, impedance matching in a working band is improved and the efficiency of the antenna is improved. The broadband horizontally polarized omnidirectional antenna is simple and compact in structure, convenient to process and low in cost.

The invention relates to a winding drum overlaying technique of a wire drawing machine, comprising the following steps of: before welding a winding drum, firstly turning a working surface of the winding drum according to abrasion requirements; fixing the winding drum on a rotary shaft, when mounting, positioning as an inner hole of the winding drum, adjusting the position to lead the working surface of the winding drum to be vertical to the position of an overlaying gun; preheating; overlaying; keeping warm after overlaying; and naturally cooling to room temperature. The invention has the advantages that an overlaying technique is used, the thickness of overlaying can be set randomly, after overlaying, the winding drum can be fine-processed, the deformation and the ellipticity of the winding drum can be minimal; and the invention has simple processing and convenient operation.

The invention provides a method for generating omni-directional circularly polarized vortex electromagnetic waves, and solves the technical problems that in the prior art, omni-directional vortex electromagnetic waves are low in gain, and circular polarization is difficult to achieve. The implementation process comprises the following steps of: designing the lens shape of a cylindrical metasurfacelens component; setting parameters of the lens component; calculating expected vortex electromagnetic wave phase distribution and metal layer geometric rotation angle distribution of the initial model; establishing a lens component initial model and performing full-wave simulation; calculating convergence phase distribution and metal layer geometric rotation angle distribution of a final model; and obtaining a final model of the lens component, and carrying out full-wave simulation verification on the final model. A planar metasurface lens formed by periodically arranging transmission unit structures is conformal to a cylindrical surface to form a cylindrical metasurface lens component. The method for generating omni-directional circularly polarized vortex electromagnetic waves has the advantages of the relatively high gain, the relatively high circular polarization purity and the simple feeding, and can be applied to the field of communication.

The invention provides an omnidirectional indoor distribution antenna applied to 5G communication. The omnidirectional indoor distribution antenna comprises horizontal polarization units, a vertical polarization unit, a dielectric plate and a feed network, wherein the horizontal polarization units are located on the dielectric plate; the dielectric plate is in a round form; the horizontal polarization units are uniformly arranged outwards by taking the center of the dielectric plate as the circle center; the vertical polarization unit is located at the circle center of the horizontal polarization units and is vertical to the horizontal polarization units, that is to say, the vertical polarization unit is vertical to the dielectric plate; each horizontal polarization unit comprises an SMA feed head, a 1-to-8 feed network, eight pairs of radiation dipoles, an FR4 dielectric plate, a ground plane shaped like the sun, eight pairs of parasitic patches and eight pairs of leading units; and the vertical polarization unit comprises the SMA feed head, the ground plane shaped like the sun and a vertical polarization radiation structure shaped like a vase. The antenna has the characteristicsof a low profile, a large impedance bandwidth, high isolation, high gain, low out-of-roundness and low cross polarization.

The invention discloses a production line for a steel wire glass fiber reinforced composite pipe. The production line comprises an inner pipe extruding machine. The downstream part of the inner pipe extruding machine is provided with a first cooling device. The downstream part of the first cooling device is provided with a first traction machine. The downstream part of the first traction machine is provided with a glass fiber belt winding unit. The downstream part of the glass fiber belt winding unit is provided with a steel wire winding unit. The downstream part of the steel wire winding unitis provided with a first air blower. The downstream part of the first air blower is provided with a gluing device. The downstream part of the gluing device is provided with a sizing cooling draught fan used for cooling the surface of a glued pipe. The downstream part of the sizing cooling draught fan is provided with an outer pipe extruding machine. The downstream part of the outer pipe extrudingmachine is provided with a second cooling device. The downstream part of the second cooling device is provide d with a second traction machine, and the downstream part of the second traction machineis provided with a pipe cutting machine. By means of the production line for the steel wire glass fiber reinforced composite pipe, steel wire glass fiber reinforced composite pipes can be continuouslyand automatically produced, the grade of the pressure of the produced steel wire glass fiber reinforced composite pipes is higher, and the performance is more stable.

Drawing methods and drawing furnaces for drawing an optical fiber with small non-circularity by simple drawing system are provided. An optical fiber preform is received into a muffle tube and heated by a primary heater placed to surround the muffle tube. The optical fiber preform is heated such that a starting position of a meniscus portion is higher in its position than the top of the primary heater, wherein the meniscus portion is created at the bottom portion of the optical fiber preform.

The invention belongs to the technical field of design for antennas, and relates to a high-gain broadband omnidirectional antenna. The high-gain broadband omnidirectional antenna comprises a half-wave dipole antenna, a reflector plate, a matching platform and a coaxial cable. The matching platform is in the shape of a circular truncated cone with lower end face open and inside hollow, and a circular hole is arranged on the upper end face of the matching platform. The half-wave dipole antenna is cylindrical, the lower half portion of the half-wave dipole antenna is disposed in the circular hole of the matching platform, and the upper half portion of the half-wave dipole antenna exposes from the upper end face of the circular hole. The circular reflector is arranged above the half-wave dipole antenna, the diameter of the reflector plate is equal to that of the lower end face of the matching platform, the reflector plate and the matching platform are concentric and arranged at positions corresponding to each other up and down. The coaxial cable is arranged below the half-wave dipole antenna, and the coaxial cable is connected with the half-wave dipole antenna to form a feed port. The high-gain broadband omnidirectional antenna solves technical problems that existing omnidirectional antennas are incapable of meeting requirements of indexes such as frequency bands, feed network, out-of-roundness of directional diagrams, wave beam direction and gain performance, and has the advantages wide frequency band, simple feed network, low out-of-roundness of directional diagrams, stable wave beam direction and high gain.

The invention relates to the stamping detection filed, and especially relates to a vehicle spoke roundness trimming device, which comprises a foundation base, a mounting base and a central spindle used for positioning and clamping a central hole of a spoke, wherein the mounting base is located on the foundation base and the mounting base is fixedly connected to the foundation base; the central spindle is located at the geometrical center of the mounting base; a top portion of the mounting base is provided with a mounting surface cooperated with an arc surface of the spoke; an edge of the mounting surface is provided with an arc baffle plate; and a heating mechanism is set above the mounting surface. According to the invention, the arc degree is trimmed through heating and rotation, thus the out-of-roundness degree of the spoke is lowered; and the spoke is avoided from being molten again and stamped, thus lowering the production cost.

The invention provides a high-refractivity, light-reflecting microspheric glass, comprising the following components in gram molecular percent: SiO2 1-12, B2O3 1.5-11, TiO2 20-55, BaO2 5-56, CaO 2-10, ZnO 0.3-10 and Sb2O3 0.1-2. And it has characters of high reflection brightness, no harmful components, and safety and no pollution.

The invention discloses a tool for performing exposed type back wiring on a pipe body. The tool comprises a tool rack, a tool seat, a cutter and a roller, wherein the bottom of the tool seat is connected with the tool rack; a gap is formed in the top of the tool seat; the cutter is mounted on the tool seat, and is used for cutting an embedding slot for paving a resistance wire in the pipe body; the roller is positioned in the gap and can rotate, and the resistance wire is arranged on the outer circular face and is conveyed into the cut slot in the pipe body through rotation; the outer circular face of the roller presses the inner wall of the pipe body to embed the resistance wire on the outer circular face of the roller into the embedding slot of the pipe body. The tool for performing exposed type back wiring on the pipe body is stable in wire laying, controllable in precision and perfect in performance.

An omnidirectional radiation oscillator array antenna for coupling feed relates to a printing antenna and resolves the problem that the existing omnidirectional antenna is narrow in bandwidth, low in gain, poor in omnidirectional performance in working band and larger in size. The antenna comprises a media plate and a coplanar waveguide center feeder. The antenna further comprises a feed port matching branch knot, radiation type terminal load and two groups of oscillators. The coplanar waveguide center feeder, the feed port matching branch knot, the radiation type terminal load and the two groups of oscillators are printed on the front plate face of the media plate, the lower end of the coplanar waveguide center feeder is connected with the feed port matching branch knot, and the upper end of the coplanar waveguide center feeder is connected with the radiation type terminal load. Each group of vibrators comprise a first vibrator and a second vibrator which are rectangular, the two groups of vibrators are symmetrically arranged along the coplanar waveguide center feeder, and a first horizontal feeder and a second horizontal feeder are printed on the back plate face of the media plate. The antenna is used for the technical field of radio engineering.

The invention relates to a quartz optical fiber and a preparation method and device thereof, and the preparation method comprises the steps: coating the surface of the quartz bare optical fiber with glass-ceramic liquid before the temperature of drawn quartz bare optical fiber is reduced to the glass-transition temperature of the quartz bare optical fiber, so as to form a glass-ceramic coating layer; and after cooling, coating the surface of the glass ceramic coating with an organic coating to form an organic coating layer, so as to obtain the quartz optical fiber, wherein the expansion coefficient of the glass ceramic is smaller than 5*10<-7> / DEG C, and the melting temperature is 1200-1400 DEG C, and the core layer and the sheath layer of the quartz bare optical fiber are made of quartz glass materials. According to the invention, the glass-ceramic coating layer with low expansion coefficient is formed on the surface of the quartz bare optical fiber by adopting a high-temperature online coating method, so that the tensile strength of the quartz optical fiber is improved.

The invention discloses a direct feed omnidirectional printed antenna with a radiation load, which relates to a printed antenna, in particular to an omnidirectional radiation printed antenna, and is used for solving the problem of incapability of simultaneously meeting the requirements of high omnidirectional radiation, large bandwidth and high gain existing in the conventional omnidirectional antenna. The lower end of a coplanar waveguide central feeder line is connected with a feeding port matching branch knot; the upper end of the coplanar waveguide central feeder line is connected with a radiation terminal load; a first vibrator and a second vibrator are mouth-shaped; one side of the first vibrator which is far away from the coplanar waveguide central feeder line is provided with a first square through hole; one side of the second vibrator which is far away from the coplanar waveguide central feed line is provided with a second square through hole; a second horizontal feeder line is connected with the first vibrator through two first metal through holes; and a third horizontal feeder line is connected with the second vibrator through two second metal through holes. The direct feed omnidirectional printed antenna is applied to the field of point-to-multipoint communication of a C waveband.

The invention discloses a 4G indoor ceiling-mounted gain antenna. The 4G indoor ceiling-mounted gain antenna includes an antenna cover and a bottom plate. A biconical antenna and a microstrip round plate antenna are mounted in a space defined by the antenna cover and the bottom plate. The biconical antenna is composed of an upper cone and a lower cone. The upper cone and the lower cone are connected to each other through a connection nut and a plastic sleeve cap, so that vertical wave radiation is formed. The microstrip round plate antenna includes a two-layer PCB substrate made of F4B material. The PCB substrate is supported between the upper cone and the lower cone by a plurality of supporting rod. The front face of the PCB is provided with a plurality of hook-shaped copper-coated parts connected together and forming an enclosed area. The back face of the PCB is provided with a plurality of T-shaped copper-coated parts connected together and forming an enclosed area. Therefore, horizontal wave radiation is formed. By adopting the above design, standing-wave ratio of the antenna can be reduced, antenna performance can be improved effectively and antenna pattern non-roundness can be reduced.

The invention relates to a high-performance omnidirectional antenna. The high-performance omnidirectional antenna is formed in the way that a plurality of radiating elements are equidistantly connected in series through a metal support bar and then supported on a fixed base; each radiating element comprises an upper metal barrel and a lower metal barrel, the opening of the upper metal barrel is upward, the bottom of the upper metal barrel is upwardly recessed to form an inner barrel of which the diameter is smaller than that of the upper metal barrel, the opening of the inner barrel is downward, the bottom of the inner barrel is sleeved on the metal support bar, the bottom of the lower metal barrel is upwardly sleeved on the metal support bar, is parallel with and keeps a certain distance away from the bottom of the upper metal barrel; and the bottom of the upper metal barrel on each radiating element is connected with a feed cable, and the feed cable penetrates the bottom of the lower metal barrel of each radiating element, extends into the metal support bar and is connected with a power divider on the fixed base. The high-performance omnidirectional antenna has a simple structure, is convenient to manufacture, puts both the broadband and the gain into consideration and is high in service performance.

The embodiment of the invention discloses an omnidirectional high-gain antenna based on meta-material. The omnidirectional high-gain antenna comprises an upper copper foil substrate and a circuit board supporting the upper copper foil substrate. The upper copper foil substrate is composed of multiple strip lines. Each strip line is composed of an upper grounding plate, a lower grounding plate anda metal conduction band. The upper grounding plate is printed on the upper copper foil substrate. The lower grounding plate is embedded in the circuit board. The metal conduction band connects the upper grounding plate and the lower grounding plate. The length of the metal conduction band is greater than half of the length of the upper grounding plate and greater than one third of the length of the lower grounding plate. The circuit board is provided with multiple metalized via holes for piercing of the adjacent metal conduction bands. The consistency and the stability of the antenna can be increased, the assembling process is simple and batch production can be facilitated, and series feeding is performed through multiple alternate feed strip lines so as to have high gain and great omnidirectional radiation characteristic.

The invention discloses a horizontal omnidirectional planar printed antenna which is characterized in that the planar printed antenna comprises three metal layers and two medium layers; the upper metal layer and the lower metal layer are metal stratums (1,3); the middle metal layer is a feeding layer (2); the center of the feeding layer is printed with a metal conduction band (5); the metal conduction band, the upper metal stratum and the lower metal stratum form a stripline transmission line; the upper and the lower metal stratums (1,3) are symmetrically manufactured with a plurality of rectangular rifts (6) along the direction of the metal conduction band; and a medium layer (4) is arranged between the metal stratums (1,3) and the feeding layer (2) respectively. The horizontal omnidirectional planar printed antenna has the advantages of high gain, good horizontal omnidirectional property, simple manufacture and low cost.

The invention specifically relates to a directional diagram reconfigurable antenna based on a switchable director, and belongs to the technical field of antennas. The antenna comprises a substrate which comprises an upper layer and a lower layer which are composed of microwave dielectric substrates; a dielectric resonator which is adhered to the upper surface of the upper layer; a pair of symmetrical metal arms surrounding the outer side of the dielectric resonator and etched on the upper surface of the upper layer; a power divider etched on the lower surface of the lower layer; a pair of switchable directors which are arranged in the upper surface of the upper layer, surround the periphery of the dielectric resonator and are symmetrical, wherein the distance from the switchable director to the center of the dielectric resonator is greater than the distance from the metal arm to the center of the dielectric resonator; metal ground arranged between the upper layer and the lower layer of the substrate, wherein the vertical projection area of the metal ground on the substrate is larger than the vertical projection area of the dielectric resonator on the substrate; and metal through holes are formed in the surfaces of the upper layer and the lower layer of the substrate. The metal arms penetrate through the substrate from top to bottom through the metal through holes and are connected with the power divider; and the metal arms and the power divider form a feed structure of the antenna.

The invention provides an omnidirectional WLAN (Wireless Local Area Networks) antenna with common-mode current suppression. The antenna comprises a radiation structure and a coaxial line, the radiation structure is formed by a first radiation unit, a second radiation unit and a third radiation unit (13) which have the same structure; each radiation unit is provided with three feed ports with the same structure, a first polygonal groove, a second polygonal groove and two same cutting angles; metal branches are arranged between the first polygonal grooves and the second polygonal grooves, the centers of the metal branches are provided with gaps; one end of the coaxial line is led in along one sides of the feed ports and is distributed at the edges of the first radiation units, and the otherend of the coaxial line is led out along the opposite sides of the feed ports and is connected with an SMA joint. The omnidirectional WLAN antenna can suppress the common mode current on the outer surface of the feed coaxial line and can reduce the distortion of the antenna directional diagram while meeting the performance of the omnidirectional WLAN antenna, and can be used for a wireless local area network communication system.

The invention discloses a drawing optical fiber torsion control device, a control method and a multimode optical fiber, which belong to the field of optical fiber manufacturing. An optical fiber torsion control device is added in the area below the optical fiber sheath coating curing device and above the traction wheel in the drawing channel, Furthermore, a periodic rotational force is applied to the optical fiber in the direction perpendicular to the optical fiber through the optical fiber twist control device, so that the optical fiber is periodically twisted. In the present invention, by adding an optical fiber twisting control device, the optical fiber after the wire-drawing coated protective layer is cured is twisted and the twisting force is transmitted, so as to eliminate the disturbance of the irregular deformation of the cone shape in the melting cone area of ​​the graphite furnace when the optical fiber prefabricated part is drawn. The out-of-roundness of the optical fiber core is reduced, the refractive index deviation of the optical fiber preform after drawing is improved, and the accuracy of the refractive index distribution is improved. Due to the torsion and rotation of the optical fiber, the distribution of the unstable residual stress in the optical fiber is optimized, which is beneficial to the correction of the deviation of the refractive index distribution caused by the reduction of the residual stress.